Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 770,036	$ 779,345
Restricted cash	333	332
Short-term investments	253,821	195,534
Receivables, net	84,555	107,547
Prepaid expenses and other current assets	15,885	29,271
Total current assets	1,124,630	1,112,029
Property and equipment, net	77,052	68,742
Goodwill	297,409	297,409
Acquired intangible assets, net	136,482	155,369
Deferred tax assets, net	7,940	10,143
Other assets	35,074	8,291
Total assets	1,678,587	1,651,983
Current liabilities:
Accounts payable and accrued expenses	93,056	89,977
Customer obligations	664,520	695,368
Other current liabilities	5,037	628
Total current liabilities	762,613	785,973
Long-term debt, net of financing costs	244,814	244,915
Other non-current liabilities	11,264	8,845
Total liabilities	1,018,691	1,039,733
Commitments and Contingencies (Note 14)
Stockholders' Equity:
Common stock, par value $0.001 per share (authorized 1,000,000 shares; 40,333 shares issued and 39,853 shares outstanding at September 30, 2018 and 40,251 shares issued and 39,771 shares outstanding at December 31, 2017)	41	41
Additional paid-in capital	579,241	562,131
Treasury stock at cost (480 shares at September 30, 2018 and December 31, 2017)	(22,309)	(22,309)
Accumulated other comprehensive loss	(841)	(354)
Retained earnings	103,764	72,741
Total stockholders’ equity	659,896	612,250
Total liabilities and stockholders’ equity	$ 1,678,587	$ 1,651,983